🔄 Multi-Chain RPC Failover System #69
Description
📌 Overview
RPC failures or latency spikes can disrupt transaction processing and data retrieval across chains. Without failover, dApps and merchants experience unreliable service.
This task introduces a Multi-Chain RPC Failover System that automatically switches between RPC providers to ensure continuous availability and reliability.
🎯 Objective
Build a system that:
- Monitors RPC provider health for all supported chains
- Automatically switches to backup RPC providers on failure or high latency
- Maintains consistent chain connectivity for all GasGuard operations
- Reduces downtime and ensures high reliability for users
🛠 Scope of Work
1️⃣ RPC Provider Management
-
Maintain a configurable list of RPC providers per chain:
- Primary and secondary endpoints
- Optional tertiary / fallback endpoints
-
Support dynamic prioritization based on:
- Response time
- Success rate
- Provider availability
2️⃣ Failover Mechanism
-
Detect RPC failures or timeouts:
- Connection errors
- High latency
- Failed JSON-RPC responses
-
Automatically switch to next available provider
-
Retry logic and backoff for transient failures
-
Ensure atomic switch without losing pending requests
3️⃣ Health Monitoring
-
Track metrics for each RPC provider:
- Response time
- Error rates
- Uptime percentage
-
Optional Prometheus / Grafana integration for monitoring and alerts
-
Log failover events for diagnostics and auditing
4️⃣ Security & Access
- Secure configuration of RPC credentials
- Protect sensitive API keys for third-party RPC providers
- Ensure failover does not compromise data integrity
🧰 Suggested Tech Stack
Core
- TypeScript
- Node.js
- Ethers.js / Viem for RPC interactions
- Redis or in-memory cache for provider state
- NestJS / Express / Fastify
Optional Enhancements
- Prometheus / Grafana for provider health monitoring
- Alerting system for failover events
- Jest (unit testing)
🧠 Implementation Expectations
- Clear separation between:
- RPC provider management layer
- Failover logic and monitoring
- API / transaction request layer
- Deterministic failover with minimal request impact
- Unit tests covering:
- RPC failure detection
- Provider switching logic
- Request retry behavior
- Multi-chain support
📊 Deliverables
- Multi-chain RPC provider configuration system
- Automatic failover mechanism integrated into GasGuard backend
- Metrics and logging for provider health and failovers
- Documentation explaining:
- Provider configuration
- Failover behavior
- Monitoring and alerting
- Unit tests (minimum 70% coverage)
- Updated README
🏷 Difficulty Level
Advanced
Ideal for contributors with:
- Backend TypeScript experience
- Knowledge of blockchain RPC interactions
- Experience with failover and high-availability systems
- Multi-chain transaction handling
🕒 Estimated Time
1–2 weeks (part-time contributor)
✅ Acceptance Criteria
- RPC failures automatically detected and switched to backup providers
- Multi-chain support functional
- Metrics and logging of failovers operational
- Configuration of RPC providers flexible and secure
- Documentation updated
- All tests passing
🎯 Expected Outcome
GasGuard achieves high reliability across multiple chains, automatically maintaining connectivity even during RPC failures, ensuring uninterrupted service for dApps and merchants.